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Degree
Confluence Project:
Educational
Activities
The
goal of the Degree Confluence Project (www.confluence.org)
is for people to visit each of the latitude
and longitude
integer degree intersections in the world using a GPS receiver, to take
photographs at each location, and to write a story about the experience.
As
of October 2005, 4,150 successful
confluences have been found and 388 secondary confluences have been
found by a total of 7.724 visitors who have taken 48,628 photographs in
168 countries. Although confluences in the oceans and some near the poles have
been excluded, there are still 12,024 yet to be found.
Author
of educational activities:
Dr.
Joseph J. Kerski, Geographer, USGS, Denver, Colorado, USA, jjkerski@usgs.gov
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Introduction
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View of the
Tasman Sea west of 41 South, 175 East, New Zealand.
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Imagine
having thousands of photographs tied to specific locations on the
Earth’s surface. The confluence project brings this
photographic library to the university, secondary, and primary
classroom. The confluence
project represents an organized sampling of the world according to
geographic location--latitude and longitude. |
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Educational Applications
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Geography
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GPS
receiver on the prime meridian, 52 North, 0 East, northeast of
London, England.
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In
the Geography curriculum, a teacher could use the project as
follows:
Coordinate
Systems
How
do we determine relative locations on the Earth's surface (by
giving directions, referring to places) and absolute locations on
the Earth's surface (latitude and longitude, Universal Transverse
Mercator coordinates, state plane coordinates, street addresses,
and other means)?
What
is latitude and longitude?
How
does GPS work? Incorporate concepts of triangulation,
measurement, and precision.
Is
your community closer to the (North or South) pole or to the
Equator? How do you know?
Is
your community closer to the Prime Meridian or to 180 degrees
longitude?
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USGS
world physical regions map.

USGS
landforms of the conterminous USA map.

USGS
land cover of the conterminous USA map.
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Location
and Region
Examine
thematic maps from the US Geological
Survey and other organizations of the world,
and of specific regions of the world. The themes should
include:
-
population
density
-
culture
-
language
-
hydrology
-
vegetation
cover
-
land
use
-
climate
and
For
specific locations on the Earth’s surface, ask the students to
predict the following variables: At any given location:
Would
you expect to find evidence of human beings? What is
the population density in this area? How can you determine the population density from a ground photograph? Why?
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Residential
construction in the Nevada desert, 36 North, 115 West.
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Human-Environment
Interaction
Is this an
area undergoing rapid population change? What clues do you find on the photographs? What is the reason why the area is or is not undergoing rapid population change?
Are more
people moving into this area or moving out of this area?
How have
humans modified the land here? For what reasons have they
done so?
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Texas
home, 30 North, 99 West.
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Dwellings
What kinds
of dwellings do people live in? Are they for one person, one
family, or numerous families? Why?
What
material are the dwellings made of? Why?
What other
buildings and human-built structures exist in the area, and what
are they used for? |
Hilly
terrain in New Zealand at 40 South 176 East.
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Landforms
What
landforms are found in this location?
Why?
What sort
of "hike" do you think you would face to reach this
location--easy or difficult? Why?
What are
the predominant physical processes in this location? In this
region? In this country?
What types
of soils
are dominant in this area?
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Devils
Lake, North Dakota, at 48 North, 99 West. This confluence
was formerly on land, but due to increased rainfall in the past
decade in the closed basin, it is now under water.
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Water
Is standing
or flowing water evident in this area? Why or why not?
If no
standing or flowing water is visible, what other signs are there
of the presence of water?
Is this an
area that is drained of water, or an area where water is brought
in from elsewhere (irrigated)?
What are
the dominant water-influenced processes operating here? |
Lighthouses
at Fort Story military base, near 37 North, 76 West, on the
Atlantic Coast of Virginia.
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Cultural
and Political Geography
What
evidence is there of the
- race,
- ethnicity,
- religion,
- cultural
values
- and
- language
of the
people living in this area? How do people "mark" their culture on the landscape?
Is the area
near a border of countries or cultures, and can the presence of
that border be detected here?
What
influence does the political structure of the country or region
have on the way people live here, or on the travelers to the
confluence?
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Colorado
corn and wheat fields at 39 North, 104 West.
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Occupation
What would you say is the predominant occupation of people living
here?
What clues
in the photographs and narratives helped you come to the
conclusion that you did? How accurate would you say your
conclusion is? |
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Juniper
and pinon vegetation in central Texas at 30 North, 100 West.
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Climate
What can
you infer about the climate of this area?
What clues
from the photographs and narratives give you an indication of the
climate of this area--precipitation amount, sunshine, average
temperature, seasonal variability, extremes, and so
on?
In what
form does most precipitation fall in this area--as snow, rain,
sleet, hail, or several of the above? |
Bayou
vegetation in Louisiana at 30 North, 90 West.

Tree
cover in Michigan's Upper Peninsula at 46 North, 88 West.

Sage
growing in southern Utah at 38 North, 113 West.
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Vegetation
What
natural vegetation types can you detect in this area?
What
is the height of the vegetation? Why?
Are the
vegetation types grown in the area natural, or were they planted
by humans?
How do the
seeds for the vegetation become dispersed?
How would
you describe the variety of vegetation in this area?
What is the
connection between climate and vegetation in general, and the
connection in this
area specifically? |
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Peanut
field in Virginia at 37 North, 77 West.
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Agricultural
Land Use
If the area
has been planted by humans, what type of vegetation is grown
there? If the area has not been planted, what are the
reasons why?
Why is this
particular type of crop grown there?
When is the
crop harvested? Why?
Who
consumes the crops grown here -- people, animals, or both?
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Deer
at 43 North, 103 West on the grasslands of South Dakota.
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Animals
and Birds
What birds
and ground animals do you predict live in this area?
What
shelters do they build, and out of what materials?
What is
their primary food source?
How does
the vegetation and climate influence the type of birds and animals
that live here?
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Transmission
towers at 41 South, 175 East in New Zealand.
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Change
What did
this area look like 100 years ago? How will it change over
your lifetime?
What forces
are acting to change the area?
Is the area
rapidly changing or slow to change compared to other areas nearby
or elsewhere in the world? Why?
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Cliff in
southern Nevada at 36 North, 115 West.
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Natural
Hazards
What are
the most common natural hazards in this area? Why? Is
this area more hazardous than the area you live in? Why or
why not?
Are there
specific time(s) during the year when these hazards are more
prevalent than others? Why? |
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History
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Closing
the ranch gate after visiting 43 North, 101 West in South
Dakota.
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How
has the area changed over the past year? The past
century? The past 2,000 years? Why?
What do you
predict this area will look like in 1 year? In 10
years? In 100 or 2,000 years? Why? |
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Biology
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Turtle in
forest in southeastern Virginia at 37 North, 77 West.
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What
is the predominant ecosystem in this area? The predominant
biome? Would you characterize it as
"healthy?" What threats does it face?
What
species dominate in this area? How are they impacted by
humans?
What can
you assess about the biodiversity in this area? |
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Language Arts
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A
geographer, park ranger, historian, and ranch landowners visit 36
North, 105 West in northern New Mexico.

Visitors
to 46 North, 88 West include teachers, scientists, and students.
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Use
the stories on the site to analyze writing style and content by
different people all over the world.
Can you determine what
is important to the writers by what they have included in their
narratives, and how they have constructed the narratives?
Can you
determine what the visitors do for work, and what they do for
recreation?
What do you
suppose the writer did during the day before and the day after he
or she visited the site?
Are the
writers from the local area that they are writing about, or are
they visitors? How might their perspective be different if a
local person was a visitor, or if a visitor actually lived in the
local area?
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Earth Science
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River
valley at 40 South, 176 East, New Zealand.
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What is the
tectonic activity of this area?
What
minerals and rock types predominate in this area? How can
you determine this based on the photograph? Obtain other
information (maps and reports) to support your investigation.
What
natural hazards predominate in this area? Is there a
specific time or times during the year when these hazards are more
prevalent than others? |
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Example Activity |
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Examine
these photographs taken on the 100th Meridian (longitude line) in
North America. Use the questions above and your own
questions to analyze what changes in the physical and cultural environment as one moves north along the
meridian, and why the changes take place. The photographs
here are selections; use additional photographs that are each one degree
along the meridian. Or, select sites along a different
meridian, or parallel, or in your own country. What changes
can you determine between each of these photographs,
and why? Investigating the Whys of Where is the essence of geographic inquiry.
The
photograph at left was taken at 19 North, 100
West, in Mexico. |
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The
photograph at left was taken at 30 North, 100 West, Texas, USA. How is this area alike and different from the ones to the north and south of it? |
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The
photograph at left was taken at 40 North, 100 West, in Kansas USA. How is this area alike and different from the ones to the north and south of it? |
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The
photograph at left was taken at 50 North, 100 West, in Canada. How is this area alike and different from the ones to the north and south of it? |
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U.S.
Department of the Interior
U.S. Geological Survey
Rocky Mountain Mapping Center
Maintainer: webmaster@rockyweb.cr.usgs.gov
URL:http://rockyweb.cr.usgs.gov/outreach/confluences.html
Last modified: 19 October 2005
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